WO2016008966A1 - Procédés pour le traitement de maladies liées à la jonction neuromusculaire - Google Patents

Procédés pour le traitement de maladies liées à la jonction neuromusculaire Download PDF

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WO2016008966A1
WO2016008966A1 PCT/EP2015/066239 EP2015066239W WO2016008966A1 WO 2016008966 A1 WO2016008966 A1 WO 2016008966A1 EP 2015066239 W EP2015066239 W EP 2015066239W WO 2016008966 A1 WO2016008966 A1 WO 2016008966A1
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Prior art keywords
muskacrd
musk
mice
muscle
nmj
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PCT/EP2015/066239
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English (en)
Inventor
Laure STROCHLIC
Julien MESSEANT
Perrine DELERS
Alexandre DOBBERTIN
Claire LEGAY
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INSERM (Institut National de la Santé et de la Recherche Médicale)
Centre National De La Recherche Scientifique (Cnrs)
Université Paris Descartes
Université Paris Diderot - Paris 7
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Priority to EP15738353.0A priority Critical patent/EP3169337A1/fr
Priority to JP2017522734A priority patent/JP2017524739A/ja
Priority to US15/324,946 priority patent/US20170209488A1/en
Priority to EP20166731.8A priority patent/EP3741375A1/fr
Publication of WO2016008966A1 publication Critical patent/WO2016008966A1/fr
Priority to US16/913,646 priority patent/US20200323900A1/en
Priority to US18/080,433 priority patent/US20230115252A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K33/00—Medicinal preparations containing inorganic active ingredients
    • A61K33/14—Alkali metal chlorides; Alkaline earth metal chlorides
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/4164—1,3-Diazoles
    • A61K31/4166—1,3-Diazoles having oxo groups directly attached to the heterocyclic ring, e.g. phenytoin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/433—Thidiazoles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P21/00—Drugs for disorders of the muscular or neuromuscular system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P21/00—Drugs for disorders of the muscular or neuromuscular system
    • A61P21/04—Drugs for disorders of the muscular or neuromuscular system for myasthenia gravis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
    • A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P39/00—General protective or antinoxious agents
    • A61P39/02—Antidotes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P7/00—Drugs for disorders of the blood or the extracellular fluid
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Definitions

  • the present invention relates to methods for treating neuromuscular junction-related diseases.
  • the neuromuscular junction is a cholinergic synapse between motor neurons and skeletal muscle fibers.
  • the formation of this chemical synapse is based on the establishment of a trans-synaptic dialogue between presynaptic motor axons and postsynaptic muscle fibers (Sanes and Lichtman, 2001).
  • the muscle-specific tyrosine kinase receptor MuSK and its co-receptor LRP4, a member of the low density lipoprotein receptor constitute the central hub regulating all steps of NMJ formation and maintenance (DeChiara et al, 1996; Hesser et al, 2006; Kim and Burden, 2008; Valenzuela et al, 1995; Weatherbee et al, 2006).
  • MuSK is a target for antibodies in the autoimmune disorder myasthenia gravis (MG) and several mutations both in its kinase and extracellular domains are responsible for MUSK-associated congenital MS (CMS) in human (Ben Ammar et al, 2013; Chevessier et al, 2004; Maselli et al, 2010; Mihaylova et al, 2009; Vincent and Leite, 2005).
  • MuSK contains in its extracellular region a frizzled-like domain (cysteine-rich domain, CRD), known to interact with Wnt molecules (DeChiara et al., 1996; Masiakowski and Yancopoulos, 1998; Stiegler et al, 2009).
  • MuSK CRD together with Igl/2 autoantibodies were recently identified in anti-AChR (acetylcholine receptor) negative MG patients and one case of a severe CMS linked to homozygous deletion in MuSK ectodomain leading to the deletion of most of the CRD has been identified (Takamori, 2012; Takamori et al, 2013; Koenig et al., unpublished data).
  • AChR acetylcholine receptor
  • NMJ formation relies upon the nerve-secreted agrin that binds to LRP4 and subsequently activates MuSK in cis.
  • Agrin- induced MuSK activation stimulates multiple signaling pathways leading to the clustering and remodeling of AChR (Kim et al, 2008; Zhang et al, 2008, 2011).
  • AChR clusters are aggregated in a broad central and prospective region of the muscle (Arber et al, 2002; Lin et al, 2001; Yang et al, 2001).
  • muscle prepatterning in which the muscle target gets ready to receive synaptic contacts is based on activation of the complex MuSK/Lrp4 (Jing et al, 2009; Kim and Burden, 2008).
  • signaling mechanisms regulating AChR prepatterning remain largely unknown.
  • Increasing evidence indicate a role of Wnt signaling in NMJ formation (Budnik and Salinas, 2011; Speese and Budnik, 2007; Wu et al, 2010).
  • Wnt is a family of secreted glycoproteins involved in numerous developmental pathways, including synapse formation and axon guidance (van Amerongen and Nusse, 2009; Dickins and Salinas, 2013; Salinas, 2012; Willert and Nusse, 2012). Wnt proteins play also an essential role during skeletal muscle development and regeneration (von Maltberger et al., 2012). At the NMJ, Wnt4 and Wntl l are required for muscle prepatterning and axon guidance (Jing et al, 2009; Gordon et al, 2012; Strochlic et al, 2012).
  • Wnt4, Wnt9a and Wntl l are able to bind MuSK through its CRD (Strochlic et al, 2012; Zhang et al, 2012).
  • these data suggest that dysfunction of MuSK CRD can be associated with the onset of myasthenic syndromes in patients, however, the physiopathological mechanisms underlying the role of MuSK CRD in Wnt induced NMJ formation and maintenance remains to be explored.
  • the present invention relates to methods for treating neuromuscular junction-related diseases.
  • the present invention is defined by the claims. DETAILED DESCRIPTION OF THE INVENTION:
  • Synapse formation relies upon the establishment of a trans-synaptic dialogue between pre- and postsynaptic cells.
  • NMJ neuromuscular synapse
  • the muscle- specific tyrosine kinase receptor MuSK contains in its extracellular region a frizzled-like domain (cysteine-rich domain, CRD), known to interact with Wnt molecules required for muscle prepatterning and axon guidance during NMJ formation.
  • CRD frizzled-like domain
  • Dysfunction of MuSK CRD can be associated with the onset of myasthenic syndromes, however MuSK CRD function in Wnt induced NMJ formation and maintenance remains to be elucidated.
  • CRD deletion of MuSK in mice caused strong defects of both muscle prepatterning and synapse differentiation including (i) a drastic deficit in AChR clusters number, size and density and (ii) excessive motor axons growth that bypass AChR clusters.
  • NMJs are able to form and mutant mice are viable, but progressively developed CMS clinical signs associated with dismantlement of NMJs, muscle weakness and fatigability.
  • forced activation of Wnt/B-catenin signaling via pharmacological injection of lithium chloride (GSK3 inhibitor) in MuSKACRD mice almost fully rescued both pre- and postsynaptic defects.
  • GSK3 inhibitor lithium chloride
  • the present invention relates to a method of treating a neuromuscular junction-related disease in a subject in need thereof comprising administering the subject with a therapeutically effective amount of at least one inhibitor of glycogen synthase kinase 3 (GSK3).
  • GSK3 glycogen synthase kinase 3
  • Treatment may be for any purpose, including the therapeutic treatment of subjects suffering from a neuromuscular junction-related disease, as well as the prophylactic treatment of subjects who do not suffer from a neuromuscular junction-related disease (e.g., subjects identified as being at high risk a neuromuscular junction-related disease).
  • treatment refers to reversing, alleviating, inhibiting the progress of a disease or disorder as described herein (i.e. a neuromuscular junction-related disease), or delaying, eliminating or reducing the incidence or onset of a disorder or disease as described herein, as compared to that which would occur in the absence of the measure taken.
  • prophylaxis or “prophylactic use” and “prophylactic treatment” as used herein, refer to any medical or public health procedure whose purpose is to prevent the disease herein disclosed (i.e. a neuromuscular junction-related disease).
  • prevent refers to the reduction in the risk of acquiring or developing a given condition (i.e. a neuromuscular junction-related disease), or the reduction or inhibition of the recurrence or said condition (i.e. a neuromuscular junction-related disease) in a subject who is not ill, but who has been or may be near a subject with the condition (i.e. a neuromuscular junction-related disease).
  • neuromuscular junction-related disease refers to a disease resulting from injury at and/or to the neuromuscular junction.
  • a neuromuscular junction-related disease or condition may be, for example, myasthenia gravis, experimentally acquired myasthenia gravis, Lambert-Eaton syndrome, Miller Fischer syndrome, congenital myasthenic syndromes, botulism, organophosphate poisoning, and other toxins that compromise the neuromuscular junction, but also multiple sclerosis, Pompe disease, and Barth syndrome.
  • GSK3 has its general meaning in the art and refers to glycogen synthase kinase 3.
  • GSK3 is a protein- serine/threonine kinase whose activity is inhibited by Akt phosphorylation.
  • GSK3 phosphorylates a broad range of substrates including glycogen synthase, several transcription factors, and translation initiation factor.
  • GSK3 is involved in multiple cellular processes including metabolism, cell survival, proliferation, and differentiation.
  • the term “inhibitor of GSK3” refers to any compound that is able to inhibit the activity or expression of GSK3. The term encompasses any GSK3 inhibitor that is currently known, and/or any GSK3 inhibitor that can be subsequently discovered or created, can be employed with the presently disclosed subject matter.
  • Example of inhibitors of GSK3 include lithium, in particular lithium chloride, AR- A014418, 4-Acylamino-6-arylfuro[2,3-d]pyrimidines, lithium, SB-415286, P24, CT98014, CHIR98023, ARA014418, AT7519, DM204, Evocapil, LY2090314, Neul20, NP01139, NP03, NP060103, NP07, NP103, SAR502250, VX608 and Zentylor.
  • inhibitors of GSK3 include those described in EP2433636, WO2007031878, WO2007016539, WO2009007457 and WO2005051392.US7595319, US20090041863, US20090233993, EP1739087A1, WO2001070729, WO 03/004472, WO 03/055492, WO 03/082853, WO 06/001754, WO 07/040436, WO 07/040438, WO 07/040439, WO07/040440, WO08/002244 and WO08/992245, WO 00/21927, EP 470490, WO 93/18766, WO 93/18765, EP 397060, WO 98/1 1103, WO 98/11 102, WO 98/04552, WO 98/04551, DE 4243321, DE 4005970, DE 3914764, WO 96/04906, WO 95/07910, DE 4217964, U.S.
  • Particular inhibitors of GSK3 are compounds selected from the group consisting of 3- [7-(2- morpholin-4-ylethoxy)quinazolin-4-yl]-2-oxo- 1 ,3-dihydroindole-5-carbonitrile; 3-[7- (2-methoxyethoxy)quinazolin-4-yl]-2-oxo-l,3-dihydroindole-5-carbonitrile; 3-[7-[2-(2- methoxyethoxy)ethoxy] quinazolin-4-yl] -2-oxo-l,3 -dihydroindo le-5 - carbonitrile; 3 - [7-(3 - morpholin-4-ylpropoxy)quinazolin-4-yl]-2-oxo-l,3-dihydroindole-5-carbonitrile; 2-hydroxy- 3-[5-(4-methylpiperazine-l-carbonyl)pyridin-2-yl]-
  • an “inhibitor of expression” refers to a natural or synthetic compound that has a biological effect to inhibit the expression of a gene.
  • said inhibitor of gene expression is a siR A, an antisense oligonucleotide or a ribozyme.
  • Inhibitors of gene expression for use in the present invention may be based on antisense oligonucleotide constructs.
  • Anti-sense oligonucleotides including anti-sense R A molecules and anti-sense DNA molecules, would act to directly block the translation of the targeted mRNA by binding thereto and thus preventing protein translation or increasing mRNA degradation, thus decreasing the level of the targeted protein (i.e. GSK3), and thus activity, in a cell.
  • antisense oligonucleotides of at least about 15 bases and complementary to unique regions of the mRNA transcript sequence encoding the target protein can be synthesized, e.g., by conventional phosphodiester techniques and administered by e.g., intravenous injection or infusion.
  • RNA interference RNA interference
  • Ribozymes are enzymatic RNA molecules capable of catalyzing the specific cleavage of RNA.
  • the mechanism of ribozyme action involves sequence specific hybridization of the ribozyme molecule to complementary target RNA, followed by endonucleo lytic cleavage.
  • Engineered hairpin or hammerhead motif ribozyme molecules that specifically and efficiently catalyze endonucleolytic cleavage of the targeted mRNA sequences are thereby useful within the scope of the present invention.
  • Specific ribozyme cleavage sites within any potential RNA target are initially identified by scanning the target molecule for ribozyme cleavage sites, which typically include the following sequences, GUA, GUU, and GUC.
  • RNA sequences of between about 15 and 20 ribonucleotides corresponding to the region of the target gene containing the cleavage site can be evaluated for predicted structural features, such as secondary structure, that can render the oligonucleotide sequence unsuitable.
  • the suitability of candidate targets can also be evaluated by testing their accessibility to hybridization with complementary oligonucleotides, using, e.g., ribonuclease protection assays.
  • antisense oligonucleotides and ribozymes useful as inhibitors of gene expression can be prepared by known methods. These include techniques for chemical synthesis such as, e.g., by solid phase phosphoramadite chemical synthesis. Alternatively, anti-sense RNA molecules can be generated by in vitro or in vivo transcription of DNA sequences encoding the RNA molecule. Such DNA sequences can be incorporated into a wide variety of vectors that incorporate suitable RNA polymerase promoters such as the T7 or SP6 polymerase promoters. Various modifications to the oligonucleotides of the invention can be introduced as a means of increasing intracellular stability and half-life.
  • Possible modifications include but are not limited to the addition of flanking sequences of ribonucleotides or deoxyribonucleotides to the 5' and/or 3' ends of the molecule, or the use of phosphorothioate or 2'-0-methyl rather than phosphodiesterase linkages within the oligonucleotide backbone.
  • Antisense oligonucleotides siRNAs and ribozymes of the invention may be delivered in vivo alone or in association with a vector.
  • a "vector" is any vehicle capable of facilitating the transfer of the antisense oligonucleotide siRNA or ribozyme nucleic acid to the cells.
  • the vector transports the nucleic acid to cells with reduced degradation relative to the extent of degradation that would result in the absence of the vector.
  • the vectors useful in the invention include, but are not limited to, plasmids, phagemids, viruses, other vehicles derived from viral or bacterial sources that have been manipulated by the insertion or incorporation of the the antisense oligonucleotide siR A or ribozyme nucleic acid sequences.
  • Viral vectors are a preferred type of vector and include, but are not limited to nucleic acid sequences from the following viruses: retrovirus, such as moloney murine leukemia virus, harvey murine sarcoma virus, murine mammary tumor virus, and rouse sarcoma virus; adenovirus, adeno-associated virus; SV40-type viruses; polyoma viruses; Epstein-Barr viruses; papilloma viruses; herpes virus; vaccinia virus; polio virus; and R A virus such as a retrovirus.
  • retrovirus such as moloney murine leukemia virus, harvey murine sarcoma virus, murine mammary tumor virus, and rouse sarcoma virus
  • retrovirus such as moloney murine leukemia virus, harvey murine sarcoma virus, murine mammary tumor virus, and rouse sarcoma virus
  • adenovirus adeno
  • Non-cytopathic viruses include retroviruses (e.g., lentivirus), the life cycle of which involves reverse transcription of genomic viral RNA into DNA with subsequent proviral integration into host cellular DNA. Retroviruses have been approved for human gene therapy trials. Most useful are those retroviruses that are replication-deficient (i.e., capable of directing synthesis of the desired proteins, but incapable of manufacturing an infectious particle). Such genetically altered retroviral expression vectors have general utility for the high-efficiency transduction of genes in vivo.
  • adeno-viruses and adeno-associated viruses are double-stranded DNA viruses that have already been approved for human use in gene therapy.
  • the adeno-associated virus can be engineered to be replication deficient and is capable of infecting a wide range of cell types and species. It further has advantages such as, heat and lipid solvent stability; high transduction frequencies in cells of diverse lineages, including hematopoietic cells; and lack of superinfection inhibition thus allowing multiple series of transductions.
  • the adeno-associated virus can integrate into human cellular DNA in a site-specific manner, thereby minimizing the possibility of insertional mutagenesis and variability of inserted gene expression characteristic of retroviral infection.
  • adeno-associated virus infections have been followed in tissue culture for greater than 100 passages in the absence of selective pressure, implying that the adeno-associated virus genomic integration is a relatively stable event.
  • the adeno- associated virus can also function in an extrachromosomal fashion.
  • Plasmid vectors have been extensively described in the art and are well known to those of skill in the art. See e.g., SA BROOK et al, "Molecular Cloning: A Laboratory Manual," Second Edition, Cold Spring Harbor Laboratory Press, 1989. In the last few years, plasmid vectors have been used as DNA vaccines for delivering antigen-encoding genes to cells in vivo. They are particularly advantageous for this because they do not have the same safety concerns as with many of the viral vectors. These plasmids, however, having a promoter compatible with the host cell, can express a peptide from a gene operatively encoded within the plasmid.
  • Plasmids may be delivered by a variety of parenteral, mucosal and topical routes.
  • the DNA plasmid can be injected by intramuscular, intradermal, subcutaneous, or other routes. It may also be administered by intranasal sprays or drops, rectal suppository and orally.
  • the plasmids may be given in an aqueous solution, dried onto gold particles or in association with another DNA delivery system including but not limited to liposomes, dendrimers, cochleate and microencapsulation.
  • the inhibitor of GSK3 is administered to the patient in a therapeutically effective amount.
  • a “therapeutically effective amount” of the inhibitor of GSK3 as above described is meant a sufficient amount of the compound. It will be understood, however, that the total daily usage of the compounds and compositions of the present invention will be decided by the attending physician within the scope of sound medical judgment.
  • the specific therapeutically effective dose level for any particular subject will depend upon a variety of factors including the disorder being treated and the severity of the disorder; activity of the specific compound employed; the specific composition employed, the age, body weight, general health, sex and diet of the subject; the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coincidential with the specific polypeptide employed; and like factors well known in the medical arts.
  • the daily dosage of the products may be varied over a wide range from 0.01 to 1,000 mg per adult per day.
  • the compositions contain 0.01, 0.05, 0.1, 0.5, 1.0, 2.5, 5.0, 10.0, 15.0, 25.0, 50.0, 100, 250 and 500 mg of the active ingredient for the symptomatic adjustment of the dosage to the subject to be treated.
  • a medicament typically contains from about 0.01 mg to about 500 mg of the active ingredient, preferably from 1 mg to about 100 mg of the active ingredient.
  • An effective amount of the drug is ordinarily supplied at a dosage level from 0.0002 mg/kg to about 20 mg/kg of body weight per day, especially from about 0.001 mg/kg to 7 mg/kg of body weight per day.
  • the inhibitor of GSK3 is administered to the subject in the form of a pharmaceutical composition.
  • the inhibitor of GSK3 may be combined with pharmaceutically acceptable excipients, and optionally sustained-release matrices, such as biodegradable polymers, to form therapeutic compositions.
  • pharmaceutically acceptable excipients such as a carboxylate, a carboxylate, a carboxylate, a carboxylate, a carboxylate, a carboxylate, or adiluent, encapsulating material or formulation auxiliary of any type.
  • the active principle in the pharmaceutical compositions of the present invention for oral, sublingual, subcutaneous, intramuscular, intravenous, transdermal, local or rectal administration, can be administered in a unit administration form, as a mixture with conventional pharmaceutical supports, to animals and human beings.
  • Suitable unit administration forms comprise oral-route forms such as tablets, gel capsules, powders, granules and oral suspensions or solutions, sublingual and buccal administration forms, aerosols, implants, subcutaneous, transdermal, topical, intraperitoneal, intramuscular, intravenous, subdermal, transdermal, intrathecal and intranasal administration forms and rectal administration forms.
  • the pharmaceutical compositions contain vehicles which are pharmaceutically acceptable for a formulation capable of being injected.
  • vehicles which are pharmaceutically acceptable for a formulation capable of being injected.
  • These may be in particular isotonic, sterile, saline solutions (monosodium or disodium phosphate, sodium, potassium, calcium or magnesium chloride and the like or mixtures of such salts), or dry, especially freeze-dried compositions which upon addition, depending on the case, of sterilized water or physiological saline, permit the constitution of injectable solutions.
  • the pharmaceutical forms suitable for injectable use include sterile aqueous solutions or dispersions; formulations including sesame oil, peanut oil or aqueous propylene glycol; and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersions.
  • the form In all cases, the form must be sterile and must be fluid to the extent that easy syringability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms, such as bacteria and fungi.
  • Solutions comprising compounds of the invention as free base or pharmacologically acceptable salts can be prepared in water suitably mixed with a surfactant, such as hydroxypropylcellulose. Dispersions can also be prepared in glycerol, liquid polyethylene glycols, and mixtures thereof and in oils. Under ordinary conditions of storage and use, these preparations contain a preservative to prevent the growth of microorganisms.
  • the inhibitor of GSK3 can be formulated into a composition in a neutral or salt form.
  • Pharmaceutically acceptable salts include the acid addition salts (formed with the free amino groups of the protein) and which are formed with inorganic acids such as, for example, hydrochloric or phosphoric acids, or such organic acids as acetic, oxalic, tartaric, mandelic, and the like. Salts formed with the free carboxyl groups can also be derived from inorganic bases such as, for example, sodium, potassium, ammonium, calcium, or ferric hydroxides, and such organic bases as isopropylamine, trimethylamine, histidine, procaine and the like.
  • inorganic acids such as, for example, hydrochloric or phosphoric acids, or such organic acids as acetic, oxalic, tartaric, mandelic, and the like.
  • Salts formed with the free carboxyl groups can also be derived from inorganic bases such as, for example, sodium, potassium, ammonium, calcium, or ferric hydroxides, and such organic bases as isopropylamine, trimethylamine,
  • the carrier can also be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), suitable mixtures thereof, and vegetables oils.
  • the proper fluidity can be maintained, for example, by the use of a coating, such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
  • the prevention of the action of microorganisms can be brought about by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, sorbic acid, thimerosal, and the like.
  • isotonic agents for example, sugars or sodium chloride.
  • Prolonged absorption of the injectable compositions can be brought about by the use in the compositions of agents delaying absorption, for example, aluminium monostearate and gelatin.
  • Sterile injectable solutions are prepared by incorporating the active compounds in the required amount in the appropriate solvent with several of the other ingredients enumerated above, as required, followed by filtered sterilization.
  • dispersions are prepared by incorporating the various sterilized active ingredients into a sterile vehicle which contains the basic dispersion medium and the required other ingredients from those enumerated above.
  • sterile powders for the preparation of sterile injectable solutions the typical methods of preparation are vacuum-drying and freeze-drying techniques which yield a powder of the active ingredient plus any additional desired ingredient from a previously sterile- filtered solution thereof.
  • the preparation of more, or highly concentrated solutions for direct injection is also contemplated, where the use of DMSO as solvent is envisioned to result in extremely rapid penetration, delivering high concentrations of the active agents to a small tumor area.
  • solutions Upon formulation, solutions will be administered in a manner compatible with the dosage formulation and in such amount as is therapeutically effective.
  • the formulations are easily administered in a variety of dosage forms, such as the type of injectable solutions described above, but drug release capsules and the like can also be employed.
  • aqueous solutions For parenteral administration in an aqueous solution, for example, the solution should be suitably buffered if necessary and the liquid diluent first rendered isotonic with sufficient saline or glucose.
  • aqueous solutions are especially suitable for intravenous, intramuscular, subcutaneous and intraperitoneal administration.
  • sterile aqueous media which can be employed will be known to those of skill in the art in light of the present disclosure. Some variation in dosage will necessarily occur depending on the condition of the subject being treated. The person responsible for administration will, in any event, determine the appropriate dose for the individual subject.
  • FIGURES
  • A Schematic representation of the wild type (WT), MuSK flox (CRD), and recombined MuSKACRD alleles. Arrowheads, primers for genotyping.
  • B Examples of Neo Southern blot hybridization analysis of the injected ES mutant clones.
  • C Genotyping by PCR. The 234 and 200 bp bands represent WT and MuSKACRD alleles, respectively.
  • D Western blot of MuSK or MuSKACRD using MuSK antibodies in HEK293T cells transfected with MuSK- HA or MuSKACRD-HA or in MuSKACRD primary myotubes after MuSK immunoprecipitation.
  • E Western blot of cell surface and total MuSK-HA and MuSKACRD- HA in HEK293T cells transfected with MuSK-HA or MuSKACRD-HA.
  • Transferrin receptor (Tfr) and a -tubulin were used as a loading control for biotinylated proteins and input respectively.
  • Trans fection of MuSK-WT-HA or MuSKACRD-HA was performed in duplicate.
  • F Confocal images of P60 WT or MuSKACRD TA muscle cross sections stained with MuSK antibody (red) together with a-BTX (AChR, green).
  • G Quantification of WT and mutated MuSK signal intensities at the synapse.
  • A-B Confocal images of whole mount left hemidiaphragms from E14 WT and MuSKACRD embryos stained with neurofilament (NF, red) and synaptophysin (Syn, red) antibodies (A-B) together with a-BTX (AChRs, green, B). Arrowheads, AChR clusters. White dashed lines delineate the synaptic endplate band and include most AChR clusters.
  • C- H Quantitative analysis of the mean neurite length (C), the endplate band width (D), the AChR clusters number (E), volume (F), intensity (G) and non innervated AChR clusters (H).
  • A Confocal images of whole mount left hemidiaphragms from El 8.5 WT and MuSKACRD embryos stained with a-BTX to visualize AChR clusters.
  • Right panels show enlarged images of boxed regions in left panel.
  • White dashed lines delineate the synaptic endplate band and include most AChR clusters. Insets in right panels are higher magnification views of AChR clusters.
  • B-E Quantifications of the endplate band width (B), the AChR clusters number (C), volume (D) and intensity (E). Numbers of AChR clusters analyzed: 806 in WT and 604 in MuSKACRD.
  • G-J Quantitative analysis of the length (G-H) and the number (I- J) of primary and secondary nerve branches. Number of primary branches analyzed: 273 in WT and 309 in MuSKACRD, secondary branches: 266 in WT and 310 in MuSKACRD. Data are shown as mean ⁇ SEM. *p ⁇ 0.05, **p ⁇ 0.01, and ***p ⁇ 0.001, ns: non significant.
  • N 6 embryos per genotype, Mann- Whitney U test. Scale bar in the merged image in A, 300 ⁇ ; in F, 50 ⁇ .
  • FIG. 1 Confocal images of whole mount P5 WT and MuSKACRD left hemidiaphragms stained as Figure 2B. White dashed lines delineate the synaptic endplate band and include most AChR clusters.
  • FIG. 1 Disorganised NMJ ultrastructures in MuSKACRD mice.
  • H-J Quantification analyses of the synaptic vesicle density (H), diameter (I) and the number of JFs (J) in MuSKACRD compared to WT mice.
  • K Representative EM of PI 20 WT and MuSKACRD TA structure.
  • L Quantification of the distance between Z-lines in MuSKACRD and WT mice.
  • M Representative EM of myelin sheath in PI 20 WT and MuSKACRD TA. Data are shown as mean ⁇ SEM. ns: non significant.
  • N 4 animals per genotype, Mann- Whitney U test.
  • N nerve; MF, muscle fiber; SVs, synaptic vesicles; JFs, junctional folds; m, mitochondria; SBL, synaptic basal lamina; arrow, presynaptic membrane; arrowhead, postsynaptic membrane; white arrow, Z-line; star, M-line.
  • A Micro-Computed tomography scans of P90 WT and MuSKACRD mice.
  • B PI 20 WT and MuSKACRD kyphotic index.
  • C Latency to fall quantifications during a rail-grip test at various time-points (P20, P40, P60 and P90).
  • D-E Quantification of fore limb (D) and hind limb (E) grip strengths in WT and MuSKACRD mice.
  • F Representative examples of twitch and tetanic contractions evoked by stimulation of the motor nerve in WT and MuSKACRD PI 20 isolated mouse hemidiaphragms.
  • the phrenic nerve was stimulated either with single or tetanic stimuli (600 ms duration) at 20, 40, 60, 80 and 100 Hz.
  • G-H Peak amplitudes of nerve-evoked single twitch and tetanic stimulations in WT and MuSKACRD mice. mN: millinewton ; g: gram.
  • I Example of repeated tetanic nerve stimulation (60 Hz, 600 ms duration at 1 Hz) that induced a degree of fatigue more pronounced in MuSKACRD than in WT.
  • J Quantification of the fatigability in WT and MuSKACRD.
  • K Example of spontaneous twitch induced by unique stimulation observed in MuSKACRD muscles.
  • WT or MuSKACRD primary cultures and treated or not with Wntl 1 (A) or LiCl (B).
  • C Examples of Wntl 1 -treated WT, Wntl 1 -treated MuSKACRD and LiCl-treated MuSKACRD primary myotubes stained with pDcatenin together with Dapi to visualize pDcatenin translocation to nuclei (arrowheads).
  • D Confocal images of whole mount E18.5 WT, NaCl- treated MuSKACRD and LiCl-treated MuSKACRD left hemidiaphragms stained as in Figure 2B. White dashed lines delineate the synaptic endplate band and include most AChR clusters.
  • E-L Quantification of the endplate band width (E), AChR clusters number (F), volume (G) and intensity (H). Number of AChR clusters tested: 2235 in WT, 846 in NaCl-treated MuSKACRD embryos and 1714 in LiCl-treated MuSKACRD embryos.
  • C-E Quantification analyses of the AChR cluster area (C), the synaptophysin area (D) and the number of fragments per AChR clusters (E).
  • the MuSK ACRD/ACRD mutant mouse line, lacking MuSK 315-478 amino acids corresponding to the CRD was established at the Mouse Clinical Institute (MCI/ICS) using proprietary vector containing floxed Neomycin resistance cassette and Protamine-Cre cassette (Illkirch, France; http://www-mci.u-strasbg.fr).
  • MCI/ICS Mouse Clinical Institute
  • protamine cassette in the construction vector offers an efficient solution for auto-excision of the floxed region when chimaera mice were bred with Cre-expressing mice.
  • the targeting vector was constructed by successive cloning of PCR products and contained a 5.5 kb fragment (corresponding to the 5' homology arm), a 4 kb floxed fragment including Protamine Cre and Neomycin selection cassettes, and a 5 kb fragment (corresponding to the 3' homology arms). Two LoxP sequences delimitating the floxed fragment were located upstream of exon 9 and downstream of exon 11.
  • the linearized construct was electroporated in Balb/CN mouse embryonic stem (ES) cells. Targeted ES clones were screened by 5' external and Protamine Cre (inside the targeting vector) LongRange PCR and by Neo Southern blot.
  • the following antibodies were used: polyclonal and monoclonal Alexa Fluor ® 488 conjugated (Life Technologies, 1/1000), polyclonal CyTM 3-conjugated (Jackson immunoresearch, 1/1000), monoclonal and polyclonal Peroxidase conjugated (Amersham, 1/10000), rabbit monoclonal anti-synaptophysin (Life Technologies, 1/5), polyclonal anti- neurofilament 68 kDa (Chemicon, 1/1000), polyclonal anti-neurofilament 165 kDa (DSHB, Iowa, USA, 1/750), polyclonal anti-HA (1/2500; Abeam), monoclonal anti-beta catenin (Life Technologies, 1/500).
  • Polyclonal anti-MuSK (Abeam, 1/200), monoclonal anti-transferrin receptor (TfR, Invitrogen, 1/500) and anti-a-tubulin (Sigma-Aldrich, 1/6000) were used for western blot.
  • Polyclonal anti-MuSK (1/500) used for immunohistochemistry is a gift from M. Ruegg (Germany).
  • Dapi (1/20000) and a-bungarotoxin (a-BTX) Alexa Fluor ® 488 conjugate (1/1000) were purchased from Euromedex and Life Technologies, respectively. Plasmids
  • HEK293T cells were cultured in DMEM supplemented with 10% fetal bovine serum, 2 mM glutamine and 2%penicillin/streptomycin (500U) at 37°C in 5% C0 2 . Cells were grown to 70%> confluence and transfected (2 to 7 ⁇ g of plasmids) using Fugen (Promega) transfection technique.
  • Muscle cells were isolated from P7-P10 hind limb Tibialis Anterior (TA) and
  • Gastrocnemius muscles from MuSACRD or WT mice Briefly, muscle tissues were excised, separated from connective tissue, minced in dissecting medium (DMEM-F12 medium containing 2 mM glutamine, 2%penicillin/streptomycin (500U), 2% Fungizone) and dissociated in dissecting medium containing 0.2% type I collagenase (Gibco) for 90min at 37°C in water bath. Cells were centrifugated, filtered and resuspended in proliferating medium (dissecting medium supplemented with 20% horse serum and 2% Ultroser G, Pall).
  • dissecting medium DMEM-F12 medium containing 2 mM glutamine, 2%penicillin/streptomycin (500U), 2% Fungizone
  • dissociated in dissecting medium containing 0.2% type I collagenase (Gibco) for 90min at 37°C in water bath. Cells were centrifugated, filtered and resuspended
  • cells were expanded in Matrigel (Corning) coated dishes for 3 to 5 days and differentiated in differentiating medium (dissecting medium supplemented with 2% horse serum) for 5 days.
  • myotubes were treated with recombinant Agrin (O ⁇ g/ml, R&D system), Wntl 1 (lOng/ml, R&D system) or LiCl (2.5 mM, Sigma) for 16h.
  • Micro Computed Tomography (micro-CT) scan analysis was performed in collaboration with the imaging platform PIPA installed in the imaging laboratory of EA 2496 (Montrouge).
  • P90 WT and MuSKACRD mice were sedated using 1.5% isoflurane in air (TEC 3 Anesteo France).
  • Entire body in dorsal and ventral decubitus of each animal was scanned by Quantum FX Perkin Elmer micro-CT device (Caliper Rikagu) in dynamic mode.
  • a tube voltage of 90 kV and a tube current of 160 ⁇ were selected.
  • Total scan time was 2x17 seconds per total animal scan.
  • the scan field of view was 2x60 mm with a spatial resolution of 118 micros (voxel size). Each scan was achieved by optimizing the resolution/dose ratio.
  • KI kyphotic index
  • the grip strength was measured using a grip force tensiometer (Bioseb) according to the TREAT -NMD guidelines. Forelimbs and hindlimbs traction strength were recorded according to the manufacter's instructions. Three measurements were performed per animal.
  • P120 Wt and MuSKACRD mice were euthanized by dislocation of the cervical vertebrae followed by immediate exsanguination.
  • Left hemidiaphragm muscles with their respective associated phrenic nerves were mounted in a silicone- lined bath filled with Krebs- Ringer solution of the following composition: 154 mM NaCl, 5 mM KC1, 2 mM CaC12, ImM MgC12, 1 ImM glucose and 5 mM HEPES (buffered at pH 7.4 with NaOH), continuously perfused with 02 at 23.1+/- 0.4°C.
  • hemidiaphragm tendons at the rib side was securely anchored onto the silicone-coated bath via stainless steel pins, while the other tendon was tied with silk thread, via an adjustable stainless steel hook, to an FT03 isometric force transducer (Grass Instruments, West Warwick, RI, USA). Muscle twitches and tetanic contractions were evoked by stimulating the motor nerve via a suction micro electrode adapted to the diameter of the nerve, with supramaximal current pulses of 0.15 ms duration, at frequencies indicated in the text. For each preparation investigated, the resting tension was adjusted at the beginning of the experiment (to obtain maximal contractile responses), and was monitored during the whole duration of the experiment.
  • Signals from the isometric transducer were amplified, collected and digitized with the aid of a computer equipped with an analogue to digital interface board (Digidata 1200, Axon Instruments, Union City, CA, USA) using Axoscope 9 software (Axon Instruments).
  • PI 20 Wt and MuSKACRD mice were sedated using 1.5% isoflurane in air (Minerve Equipement veterinaire). Tibialis anterior were then dissected and immediately fixed in 2% glutaraldehyde and 2% paraformaldehyde in PBS for 1 h at room temperature and overnight at 4°C. TA muscle were rinsed in PBS and AChE staining following Koelle's protocol was performed. The endplate-containing tissue blocks were cut in small pieces.
  • tissue samples were washed three times in 0.1 M sodium phosphate buffer, incubated 30 min at 4°C in 1% osmic acid in sodium phosphate buffer and dehydrated in graded ethanol solutions (2x10 min in 70%, 2x10 min in 90% and 2x10 min in 100% ethanol). Samples were then incubated twice in propylene for 1 min, 10 min in 50% 50% Epon-50% propylene oxide, then embedded in Epon and incubated for polymerisation 24h at 60°C. Finally, 90 nm sections were cut on a Reichert Ultracut S and layed on a grid for staining 10 min with 2% uranyl acetate and 4 min with lead citrate at RT. The observations were performed with a JEOL 1011 transmission electron microscope and the images recorded at 80 kv with a GAT AN Erlangshen 1000 camera.
  • Diaphragm muscles were dissected and fixed (4% paraformaldehyde in PBS) for 1 h at room temperature and further fixed (1% formaldehyde in PBS) overnight at 4°C. Muscles were washed three times for 15 minutes in PBS, incubated for 15 minutes with 100 mM glycine in PBS and rinsed in PBS. Muscles were permeabilized (0.5% Triton X-100 in PBS) for 1 h and blocked for 4 hours in blocking buffer (3% BSA, 5% goat serum and 0,5%> Triton X-100 in PBS). Muscles were incubated overnight at 4°C with rabbit polyclonal antibodies against neurofilament and synaptophysin in blocking solution.
  • Confocal images presented are single-projected image derived from overlaying each set of stacks.
  • image stacks were quantified using the ImageJ (version 1.46m) plugin "3D object counter" (Bolte and Cordelieres, 2006).
  • the threshold intensity was set by visual inspection of AChR clusters, being the same between WT and MuSKACRD images.
  • the endplate band width was defined by the distance between the two farthest AChR clusters from the main nerve trunk. Around 100 measurements regularly spaced and covering the entire diaphragm were taken. At least 4 diaphragms or 50 isolated muscle fibers of each genotype were analyzed and quantified.
  • image stacks corresponding to nuclei were used for quantification using the ImageJ intensity plot profile measuring the intensity of ⁇ -catenin and Dapi fluorescence within the segmented line.
  • Neonatal and pregnant mice intra-peritoneal injections. E12 pregnant mice or P10 adult mice were intraperitoneally injected with LiCl
  • the inventors generated a mouse line deleted from the MuSK CRD by homologous recombination (Figure 1 A).
  • Figure 1 A To construct the MuSK-CRD floxed allele, we created a targeting vector consisting of the MuSK gene flanked by two loxP sites upstream of exon 9 and downstream of exon 11. The construct was electroporated in Balb/CN mouse embryonic stem (ES) cells and the injected clones were controlled by Neo Southern blot performed on two distinct digests using a Neo probe to verify the 5' arm integration by homologous recombination (Apa LI and Eco Rl) and the 3 ' arm integration (Drd 1 and Xcm 1, Figure IB).
  • ES mouse embryonic stem
  • MuSKACRD homozygous MuSK ACRD/ACRD
  • MuSKACRD adult mice exhibit immature and fragmented NMJs.
  • WT NMJs formed a continuous branched postnatal topology and exhibited a typical "pretzel- like" structure (Figure 5 A, right panel).
  • 10% of the analyzed NMJs in MuSKACRD were similar in shape to WT ones.
  • the structure of most MuSKACRD synapses (90%> of the analyzed NMJs) was severely altered with the following characteristics: the postsynaptic network was discontinuous and isolated AChR clusters were frequently observed, suggesting fragmentation of the NMJs. Indeed, the number of AChRs fragments per NMJ was increased by 4-fold (Figure 5E).
  • MuSKACRD mice progressively develop muscle weakness, fatigue and motor defects.
  • MuSKACRD mice developed normally without any gross physical signs of muscle weakness compared to WT mice. After this period, changes in the trunk region became progressively evident by the abnormal spine curvature caused by the shrinkage of the pelvic and scapular region.
  • the computed tomography scan analysis performed on P90 WT and MuSKACRD mice illustrates the kyphosis developed by MuSKACRD mice ( Figure 7A).
  • LiCl a well-known reversible inhibitor of the Gsk3 and activator of Wnt/p-catenin signaling
  • LiCl treatment of MuSKACRD primary myotubes resulted in a 6-fold increase in the number of AChR clusters and increased ⁇ -catenin translocation to the nucleus compared to Wnt 11 -treated MuSKACRD myotubes suggesting that LiCl is able to rescue AChR clustering and Wnt canonical signaling in MuSKACRD myotubes ( Figure 8B and 8C).
  • LiCl-treated MuSKACRD embryos significantly gained AChR clusters in number (by 103%), volume (by 186%) and intensity (by 20%) and were almost indistinguishable from WT embryos (Figure 8F-H).
  • presynaptic defects were improved in LiCl-treated MuSKACRD.
  • the increased length of primary and secondary branches observed in MuSKACRD was reduced respectively by 35% and 28% in LiCl-treated MuSKACRD embryos, being almost similar to WT embryos ( Figure 81 and 8 J).
  • the number and length of bypassing neurites were reduced by 33% and 138% respectively in LiCl-treated MuSKACRD embryos compared to NaCl-treated ones ( Figure 8K and 8L).
  • NMJ structures of P40 TA isolated muscle fibers from LiCl-treated MuSKACRD were increased in size compared to NaCl-treated MuSKACRD NMJ ( Figure 9B).
  • the AChR cluster and synaptophysin area in LiCl-treated mutants were increased by 40% and 105%, respectively compared to NaCl-treated mice ( Figure 9C and 9D).
  • the number of AChRs fragments per NMJ in LiCl-treated mutants was decreased by 44% compared to NaCl-treated mice ( Figure 9E).
  • LiCl treatment significantly improved MuSKACRD mice latencies to fall from the rail grip as well as fore and hind limb strength compared to NaCl-treated MuSKACRD mice (Figure 9F-H).
  • LiCl treatment to postnatal MuSKACRD mice improves the NMJ morphological defects, muscle strength and restores beta-catenin translocation to synaptic nuclei suggesting that MuSK CRD plays a role during NMJ maintenance in adulthood likely in part via activation of the Wnt ⁇ -catenin signaling pathway
  • MuSK- Wnt binding domain CRD
  • MuSK CRD deletion is pathogenic in adult mice, inducing CMS-like symptoms including kyphosis, NMJs dismantlement, muscle weakness and fatigability as previously observed in other mice models of CMS (Bogdanik and Burgess, 2011 ; Chevessier et al, 2008, 2012; Gomez et al, 1997; Webster et al, 2013).
  • our data uncover a critical role for MuSK CRD in NMJ formation and function in adulthood.
  • Wnts proteins are known to be involved in muscle prepatterning early during NMJ formation (Wu et al, 2010). Moreover, in zebrafish, Wnt 1 1 induced aneural AChRs clustering requires the CRD of Unpplugged/MuSKD(Jing et al, 2009). However, zebrafish lacking muscle prepatterning are able to form NMJ and are fully motile leaving open the question of the exact role of the prepatterning in NMJ functioning (Jing et al, 2009; Gordon et al, 2012).
  • Frizzled (Fzd) receptors are expressed in skeletal muscle cells and could mediate Wnt signaling to contribute to muscle prepatterning (Aviles et al, 2014; Strochlic et al, 2012).
  • MuSK and Lrp4 expression in early fused myofibers is sufficient to auto-activate MuSK and initiate muscle prepatterning (Burden et al, 2013; Kim and Burden, 2008). Wnts binding to MuSK CRD could therefore maintain or reinforce MuSK activation to amplify muscle prepatterning.
  • MuSK null mutant mice motor axons grow excessively throughout the muscle (DeChiara et al, 1996). Similarly, both during muscle prepatterning and later during NMJ formation, MuSKACRD motor axons overshoot AChR clusters and grow aberrantly all over the muscle. This result underlines the importance of the MuSK CRD in regulating a muscle retrograde stop signal for motor axons.
  • MuSKACRD mice are viable at birth and reach adulthood without any obvious abnormal phenotype during the first two weeks.
  • mice deficient for MuSK fail to form NMJs and die at birth due to respiratory failure (DeChiara et al, 1996).
  • These data suggest that the remaining activity of MuSK deleted from its CRD is sufficient to prevent mutant mice from lethality.
  • two weeks after birth MuSKACRD mice start to develop CMS-like symptoms. Morphological analysis of adult MuSKACRD NMJs reveals abnormal endplates architecture, with an immature phenotype at P20 followed by a severe dismantlement at P60.
  • NMJ fragmentation is often associated with muscle weakness as it has been described in CMS patients (Slater et al, 2006). Indeed, MuSKACRD adult mice develop fatigable muscle weakness highlighted by abnormal performance in the grip test assay, ex vivo isometric diaphragm contraction and fatigability measurement in response to nerve stimulation. Interestingly, one mutant mouse over five mice tested for isometric diaphragm contraction exhibits spontaneous twitches after a unique stimulation, a phenomenon often caused by muscle denervation (Heckmann and Ludin, 1982). In line with this observation, analysis of the NMJ innervation pattern in P90 MuSKACRD mice reveals the presence of non innervated AChR clusters suggesting a denervation- like process.
  • Electron microscopy analyses of adult MuSKACRD NMJs reveal defects in presynaptic vesicle density and postsynaptic folds structure associated with either few or highly disorganized junctional folds (JFs).
  • JFs junctional folds
  • AChR clusters and JFs are required for the genesis of an efficient endplate potential leading to the activation of the voltage-gated sodium channels concentrated in the depth of the JFs (Engel and Fumagalli, 1982; Marques et al, 2000).
  • JFs junctional folds
  • LiCl is currently used as a pharmacological reagent to treat bipolar, Parkinson's and Hungtinton's diseases (Klein and Melton, 1996; Schou, 2001; Chiu et al, 2011; Yong et al, 2011).
  • LiCl treatment rescues beta-catenin signaling and improves the impaired NMJ defects in both MuSKACRD embryos and adult mice suggesting that the defects observed during NMJ formation and maintenance in MuSKACRD mice are in part due to inhibition of the Wnt canonical signaling pathway.
  • Frizzled-9 impairs acetylcholine receptor clustering in skeletal muscle cells. Front. Cell. Neurosci. 8, 110.
  • Lithium chloride attenuates cell death in oculopharyngeal muscular dystrophy by perturbing Wnt/p-catenin pathway. Cell Death Dis. 4, e821.
  • MuSK is required for anchoring acetylcholinesterase at the neuromuscular junction. J. Cell Biol. 165, 505-515.
  • Wnt signals organize synaptic prepattern and axon guidance through the zebrafish unplugged/MuSK receptor. Neuron 61, 721-733. Jones, K., Wei, C, Iakova, P., Bugiardini, E., Schneider-Gold, C, Meola, G., Woodgett, J., Killian, J., Timchenko, N.A., and Timchenko, L.T. (2012). GSK3P mediates muscle pathology in myotonic dystrophy. J. Clin. Invest. 122, 4461-4472.
  • Lrp4 is a receptor for Agrin and forms a complex with MuSK. Cell 135, 334-342.
  • Mihaylova V., Salih, M.A.M., Mukhtar, M.M., Abuzeid, H.A., El-Sadig, S.M., von der Hagen, M., Huebner, A., Nurnberg, G., Abicht, A., Miiller, J.S., et al. (2009). Refinement of the clinical phenotype in musk-related congenital myasthenic syndromes. Neurology 73, 1926-1928.
  • Receptor tyrosine kinase specific for the skeletal muscle lineage expression in embryonic muscle, at the neuromuscular junction, and after injury. Neuron 15, 573-584.
  • Lithium and neuropsychiatric therapeutics neuroplasticity via glycogen synthase kinase-3beta, beta-catenin, and neurotrophin cascades. J. Pharmacol. Sci. 110, 14-28.
  • LDL-receptor-related protein 4 is crucial for formation of the neuromuscular junction. Dev. Camb. Engl. 133, 4993-5000.
  • Lithium fails to protect dopaminergic neurons in the 6-OHDA model of Parkinson's disease. Neurochem. Res. 36, 367-374.
  • LRP4 serves as a coreceptor of agrin. Neuron 60, 285-297.
  • Agrin binds to the N-terminal region of Lrp4 protein and stimulates association between Lrp4 and the first immunoglobulin-like domain in muscle-specific kinase (MuSK). J. Biol. Chem. 286, 40624- 40630.

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Abstract

La présente invention concerne des méthodes de traitement de maladies liées à la jonction neuromusculaire. La présente invention concerne en particulier une méthode de traitement d'une maladie liée à la jonction neuromusculaire chez un sujet le nécessitant, qui consiste à administrer au sujet une quantité thérapeutiquement efficace d'au moins un inhibiteur de glycogénésynthétase kinase 3 (GSK3).
PCT/EP2015/066239 2014-07-17 2015-07-16 Procédés pour le traitement de maladies liées à la jonction neuromusculaire WO2016008966A1 (fr)

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